Santosh picked a card from a deck of 52 cards and noted the symbol on the card. He repeated this experiment 120 times and records his observation in the table shown.Which of the following shows that the sum of probabilities of all events (getting a heart, getting a spade,getting a diamond and getting a club) is equal to 1? *

a. 0.36 + 0.21 + 0.33 + 0.30 = 1
b. 0.3 + 0.175 + 0.275 + 0.25 = 1
c. 0.3 + 0.075 + 0.375 + 0.25 = 1
d. 0.2 + 0.175 + 0.275 + 0.35 = 1
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a is the correct answer
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